Heavy Duty Version of 23-047?

A contractor from Savanna, Illinois 61074 says:
This is a picture of the original closet rollers I am looking for. I did order one from SWISCO Part #23-047 and I received but a little different. Seemed like lighter duty. I was wanting to get 6 of these if you do have the heavier duty or I can order 5 more of the one I received.
No numbers, just the same as yours says about "To Lower Door" on the back.
Please advise, Thank you.
Thumbnail of the uploaded file named Closet Roller Back.jpg
Thumbnail of the uploaded file named Closet Roller Front.jpg
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Tom from SWISCO responded:

I don't believe there's a heavy duty version of the 23-047. It's possible yours was made by a different manufacturer, or maybe just an older version by the same manufacturer. Companies who make this kind of hardware often change the materials used to make it to save on manufacturing costs. 

Either way, as long as the dimensions match up to our 23-047 then it is probably our best replacement option.

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